Patent · US Expired

Internal gear pump

US4813853A · kind A · utility

19Cited by

15References

11Claims

0Family size

Assignee

Barmag AG · DE

Inventors

Dieter Otto · Achern, DE
Siegfried Hertell · Radevormwald, DE

Key dates

Filing date	Jul 15, 1987
Grant date	Mar 21, 1989
Priority date	—
Expiry date	Jul 15, 2007

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04C2/102
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A hydraulic gear pump is disclosed wherein the meshing teeth of the gears define fluid cells which are expanded in the intake portion and receive the fluid from an inlet, and then compressed in the discharge portion to expel the fluid. The contact ratio of the cooperating driving flanks of the meshing teeth is smaller than the contact ratio of the cooperating sealing flanks of the meshing teeth, which serves to minimize the power requirement of the pump. The inlet to the pump includes at least two parallel lines which are each connected to a tank, and the first line is provided with a fixed throttle and the second line is provided with a pressure control valve which is controlled by the pressure in the pump discharge line.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.